Fill in the blanks with suitable words. Unwanted sound is called …………………... .

Fill in the blanks with suitable words. The unit of frequency is ……………... .

Fill in the blanks with suitable words. Loudness is determined by the …………………… of vibration .

Fill in the blanks with suitable words. Shrillness of sound is determined by the ……………………of viberation .

Fill in the blanks with suitable words. Time taken by an object to complete one oscillation is called………………… .

Fill in the blanks with appropriate words. Synthetic fibres are also called ………………or…………. Fibres.

Fill in the blanks: -87-:1 = -

Fill in the blanks: _-:48 = -1

Fill in the blanks. Waste water released by houses is Called______ .

Fill in the blanks: -87-: __= 87

Fill in the blanks: -(_)-:(4) = -3